Klaxons have been added to the line-up of Poland's Heineken Open'er Festival.

The Golden Skans rockers will play the first date of their summer tour at the music event, which runs from July 1 until July 4 in Gdynia, Poland, with other headline acts this year including Pearl Jam, Kasabian, Massive Attack, Hot Chip, Pavement, The Hives and Gorillaz Sound System.

Ben Harper's Relentless7, Empire Of The Sun and Matisyahu have also just been added to the line-up of the beach-side event.

Open'er won Best Major Festival at the European Festival Awards, beating UK favourites Glastonbury and Big Chill, as well as the hugely popular Benicassim and Exit Festivals to scoop the gong.

Full weekend camping and festival passes (four days) are available for approximately 98 Euros from www.opener.pl